By default, Elasticsearch configures the JVM to dump the heap on out of
memory exceptions to the default data directory (this is
/var/lib/elasticsearch for the RPM and Debian package
distributions, and the data directory under the root of the
Elasticsearch installation for the tar and zip archive
distributions). If this path is not suitable for receiving heap dumps,
you should modify the entry -XX:HeapDumpPath=... in
jvm.options. If you specify a directory, the JVM
will generate a filename for the heap dump based on the PID of the running
instance. If you specify a fixed filename instead of a directory, the file must
not exist when the JVM needs to perform a heap dump on an out of memory
exception, otherwise the heap dump will fail.